diff options
Diffstat (limited to 'include/asm-i386/pgtable-2level.h')
-rw-r--r-- | include/asm-i386/pgtable-2level.h | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/include/asm-i386/pgtable-2level.h b/include/asm-i386/pgtable-2level.h new file mode 100644 index 00000000000..fa07bd6c752 --- /dev/null +++ b/include/asm-i386/pgtable-2level.h @@ -0,0 +1,69 @@ +#ifndef _I386_PGTABLE_2LEVEL_H +#define _I386_PGTABLE_2LEVEL_H + +#include <asm-generic/pgtable-nopmd.h> + +#define pte_ERROR(e) \ + printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, (e).pte_low) +#define pgd_ERROR(e) \ + printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) + +/* + * Certain architectures need to do special things when PTEs + * within a page table are directly modified. Thus, the following + * hook is made available. + */ +#define set_pte(pteptr, pteval) (*(pteptr) = pteval) +#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) +#define set_pte_atomic(pteptr, pteval) set_pte(pteptr,pteval) +#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval)) + +#define ptep_get_and_clear(mm,addr,xp) __pte(xchg(&(xp)->pte_low, 0)) +#define pte_same(a, b) ((a).pte_low == (b).pte_low) +#define pte_page(x) pfn_to_page(pte_pfn(x)) +#define pte_none(x) (!(x).pte_low) +#define pte_pfn(x) ((unsigned long)(((x).pte_low >> PAGE_SHIFT))) +#define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot)) +#define pfn_pmd(pfn, prot) __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot)) + +#define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT)) + +#define pmd_page_kernel(pmd) \ +((unsigned long) __va(pmd_val(pmd) & PAGE_MASK)) + +/* + * All present user pages are user-executable: + */ +static inline int pte_exec(pte_t pte) +{ + return pte_user(pte); +} + +/* + * All present pages are kernel-executable: + */ +static inline int pte_exec_kernel(pte_t pte) +{ + return 1; +} + +/* + * Bits 0, 6 and 7 are taken, split up the 29 bits of offset + * into this range: + */ +#define PTE_FILE_MAX_BITS 29 + +#define pte_to_pgoff(pte) \ + ((((pte).pte_low >> 1) & 0x1f ) + (((pte).pte_low >> 8) << 5 )) + +#define pgoff_to_pte(off) \ + ((pte_t) { (((off) & 0x1f) << 1) + (((off) >> 5) << 8) + _PAGE_FILE }) + +/* Encode and de-code a swap entry */ +#define __swp_type(x) (((x).val >> 1) & 0x1f) +#define __swp_offset(x) ((x).val >> 8) +#define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 1) | ((offset) << 8) }) +#define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_low }) +#define __swp_entry_to_pte(x) ((pte_t) { (x).val }) + +#endif /* _I386_PGTABLE_2LEVEL_H */ |